Het Streeperkruis is at only about 5 minutes walking distance from the train station. From Heerlen or Kerkrade trains from Veolia drive to the Landgraaf train station. From Herzogenrath (Germany) you can take a train of Deutsche Bahn to Landgraaf. From Aachen you can take a train to Herzogenrath, where you can change trains; in Herzogenrath you only have to wait a few minutes.
You can also take bus lines 22, 25 and 29 to bus stop "Streep".